[cctalk] Video/keyboard mono cable for Sun 386i

Hi. I recently bought a Sun Microsystems 386i and I discovered (too late...) that monitor and keyboard are connected to the same D15 connector on the back using a "Y" cable (I had experience with other Sun workstations, this was first contact with Intel-based hardware). Unfortunately, I have not such a cable neither I was able to find any info on the web about the pinout/wiring; probably it would be possible to create the cable from scratch (assuming that no other circuitry was inside the original Y cable). Moreover, I discovered that there is more than one option for video boards (mono and color): therefore, there is more than a single Y cable to connect monitor and keyboard. Looking at the official Sun's hardware list, I found this item: 630-1621     386i video/keyboard cable but it does not specify whether it is the mono or the color cable. In any case, it seems impossible to buy it on eBay or similar. Does anybody have some information on how to rebuild it? Thank you. -s